It would be pleasant to believe that the application of the doctrine of chances to problems of this character is quite generally recognized; but this recognition is so often accompanied by the feeling that the law very clearly applies to all cases but the one that happens to be under discussion, that I fear the belief is unwarranted. Moreover, the notion seems to prevail that these coincidences should occur with equal frequency to all persons; while, in fact, the law of probability provides for the most various distribution among individuals. However, the attempt, and it may be the sincere attempt, to apply proper conceptions of probability and improbability to such problems often fails, because of an unfortunate mental attitude which presents, with an outward acquiescence in the objective view of the problem, an inward conviction in which the subjective interpretation is really dominant; for this and other reasons, this objective method of viewing the matter, however pertinent, is not the most important. II One of the most deplorable attitudes towards the borderland phenomena of which mental telegraphy or telepathy forms a type, is that which insists upon an exact and detailed explanation of concrete personal experiences, and regards these as so essentially peculiar that it refuses to consider them in connection with the many other instances of the same class, without reference to which a rational explanation is unattainable. This tendency, to insist that the laws of science shall be precisely and in detail applicable to individual experiences possessing a personal interest for us, has wrought much havoc; it has contributed to superstition, fostered pseudo-science, and encouraged charlatanism. To antagonize this tendency it is necessary to insist upon the statistical nature of the inquiry. We should certainly be familiar in this statistic-filled age with the law-abiding character of individual happenings when considered in large groups. So many types of facts depending upon individual and heterogeneous motives shoot together and form curves of surprising regularity; the number of marriages or of misdirected letters, the falsification of ages or the distribution of heights of individuals, and countless other items that in individual cases seem accidental, or capricious, or due to a host of minute and unaccountable factors, none the less present a striking statistical regularity. The owners of a gaming-table, counting upon the statistical regularity of the accidental, are assured of a steady income; they are interested long enough to obtain an extensive view of the fluctuations, and to see the law that guides the whole. Not so the individual player; he is interested only in that particular portion of the game in which his money is at stake. He detects mysterious laws of fortune and freaks of luck; sees in a series of coincidences or momentary successes the proofs of his pet schemes, and dismisses the general doctrine of chances with disdain,